Match List-I with List-II.
| List-I | List-II | ||
|---|---|---|---|
| (A) | Surface Tension | (I) | pascal second |
| (B) | Acceleration | (II) | newton second |
| (C) | Impulse | (III) | joule/meter2 |
| (D) | Viscosity | (IV) | meter/second2 |
Choose the most appropriate answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
The SI unit of a quantity follows from its defining formula: put the units of each term into the formula.
(A) Surface Tension — this matches (III) joule/meter2. Surface tension is the energy needed per unit area of new surface (or force per unit length), so its unit is J/m2, the same as N/m.
(B) Acceleration — this matches (IV) meter/second2. Acceleration is the change of velocity per second: (m/s) ÷ s = m/s2.
(C) Impulse — this matches (II) newton second. Impulse is force × time (equal to the change in momentum), so its unit is N s.
(D) Viscosity — this matches (I) pascal second. The coefficient of viscosity is the shearing stress (Pa) divided by the velocity gradient (per second), so its SI unit is Pa s, the same as N s/m2.